All the electrician did was disconnect three wires from the old box, the main feeds, pulled the box from the wall, disconnected the bus bar and old circuits on the back and mark the wires (MARK THE WIRES) then set in the new panel frame, connect the circuits to the breaker bars, set it in and then reconnect the main feeds, 3 wires.

If something happens at the last minute, and the deal falls apart, you have to deal with reconnection.

Fix: Shut off system, power off outside unit at disconnect, hose out condenser (gently) with garden hose and nozzle, let it dry out for a couple of hours, reconnect power outside, turn system on.I haven't seen this one myself, but it's possible: most furnaces since the late 80s or early 90s have an interlock switch on the blower compartment door; if you take the door off (like to change the filter), it shuts off all the power to the furnace, which also makes the A/C not work. 

I have winterized my house flips and now have to quickly dewinterize for home inspections... any ideas how to avoid having to reconnect all utilities etc..?

I recommend a great place to get reconnected with your REI ways would be through the articles, pod cast, and active use of the forums on Bigger Pockets.

I was able to get it all working again after reconnecting accounts.

Would be great to reconnect, I'll send a PM! 

Bigger Pockets is a great source of RE connections.

We left on terms of reconnecting in the near futures to see how we could work together. 

Looking forward to reconnecting.